Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for mobile devices and optical imaging lens thereof. Optical imaging lens may comprise an aperture stop and six lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.

INCORPORATION BY REFERENCE

This application claims priority from P.R.C. Patent Application No.201510034252.0, filed on, Jan. 23, 2015, the contents of which arehereby incorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present disclosure relates to mobile devices and optical imaginglens thereof. More specifically, the present disclosure relates tomobile devices applying optical imaging lens that may comprise six lenselements and an optical imaging lens thereof.

BACKGROUND

In recent years, a trend has emerged for smaller sized mobile phones.This trend has triggered the development of smaller optical lenselements. Reducing the length of the optical imaging lens and ensuringthe optical efficiency may be desirable development targets for theoptical lens industry. U.S. Pat. No. 7,830,620 discloses an opticalimaging lens constructed with an optical imaging lens having six lenselements, wherein the first lens element has negative refracting powerand the second lens element has positive refracting power. The opticalimaging lenses of such systems are too long for smaller sized mobiledevices. Therefore, there is a need for optical imaging lens which maybe capable of being placed with six lens elements therein, may have ashorter length, and may also have good optical characteristics andbigger field angle.

SUMMARY

The present disclosure may advantageously provide for a mobile deviceand an optical imaging lens thereof. With controlling the convex orconcave shape of the surfaces, the length of the optical imaging lensmay be shortened while maintaining good optical characteristics andsystem functionality.

In some embodiments, an optical imaging lens may comprise, sequentiallyfrom an object side to an image side along an optical axis, an aperturestop, first, second, third, fourth, fifth and sixth lens elements. Eachof the first, second, third, fourth, fifth and sixth lens elements mayhave refracting power, an object-side surface facing toward the objectside and an image-side surface facing toward the image side, and acentral thickness defined along the optical axis.

In the specification, parameters used here are: the central thickness ofthe first lens element, represented by T1, an air gap between the firstlens element and the second lens element along the optical axis,represented by G12, the central thickness of the second lens element,represented by T2, an air gap between the second lens element and thethird lens element along the optical axis, represented by G23, thecentral thickness of the third lens element, represented by T3, an airgap between the third lens element and the fourth lens element along theoptical axis, represented by G34, the central thickness of the fourthlens element, represented by T4, an air gap between the fourth lenselement and the fifth lens element along the optical axis, representedby G45, the central thickness of the fifth lens element, represented byT5, an air gap between the fifth lens element and the sixth lens elementalong the optical axis, represented by G56, the central thickness of thesixth lens element, represented by T6, a distance between the image-sidesurface of the sixth lens element and the object-side surface of afiltering unit along the optical axis, represented by G6F, the centralthickness of the filtering unit along the optical axis, represented byTF, a distance between the image-side surface of the filtering unit andan image plane along the optical axis, represented by GFP, a focusinglength of the first lens element, represented by f1, a focusing lengthof the second lens element, represented by f2, a focusing length of thethird lens element, represented by f3, a focusing length of the fourthlens element, represented by f4, a focusing length of the fifth lenselement, represented by f5, a focusing length of the sixth lens element,represented by f6, the refracting index of the first lens element,represented by n1, the refracting index of the second lens element,represented by n2, the refracting index of the third lens element,represented by n3, the refracting index of the fourth lens element,represented by n4, the refracting index of the fifth lens element,represented by n5, the refracting index of the sixth lens element,represented by n6, an abbe number of the first lens element, representedby v1, an abbe number of the second lens element, represented by v2, anabbe number of the third lens element, represented by v3, an abbe numberof the fourth lens element, represented by v4, an abbe number of thefifth lens element, represented by v5, an abbe number of the sixth lenselement, represented by v6, an effective focal length of the opticalimaging lens, represented by EFL, a distance between the object-sidesurface of the first lens element and an image plane along the opticalaxis, represented by TTL, a sum of the central thicknesses of all sixlens elements, i.e. a sum of T1, T2, T3, T4, T5 and T6, represented byALT, a sum of all five air gaps from the first lens element to the sixthlens element along the optical axis, i.e. a sum of G12, G23, G34, G45and G56, represented by AAG, a back focal length of the optical imaginglens, which is defined as the distance from the image-side surface ofthe sixth lens element to the image plane along the optical axis, i.e. asum of G6F, TF and GFP, and represented by BFL.

According to an aspect of the optical imaging lens of the presentdisclosure, the first lens element may have positive refracting power,the object-side surface of the first lens element may comprise a convexportion in a vicinity of the optical axis and a convex portion in avicinity of a periphery of the first lens element; the second lenselement may have negative refracting power, the object-side surface ofthe second lens element may comprise a concave portion in a vicinity ofthe periphery of the second lens element; the image-side surface of thethird lens element may comprise a convex portion in a vicinity of theperiphery of the third lens element; the fourth lens element may havepositive refracting power; the fifth lens element may have positiverefracting power, the image-side surface of the fifth lens element maycomprise a concave portion in a vicinity of a periphery of the fifthlens element; the image-side surface of the sixth lens element maycomprise a convex portion in a vicinity of a periphery of the sixth lenselement. In some embodiments, optical imaging lens may comprise no otherlenses having refracting power beyond the six lens elements.

In some embodiments, other equation(s), such as those relating to theratio among parameters may be taken into consideration. For example,ALT, G23 and G45 may be controlled to satisfy the equation as follows:ALT/(G23+G45)≥9.0  Equation (1); or

T2 and T5 may be controlled to satisfy the equation as follows:T5/T2≤2.2  Equation (2); or

T1 and T3 may be controlled to satisfy the equation as follows:T1/T3≥0.8  Equation (3); or

T6, G12 and G56 may be controlled to satisfy the equation as follows:T6/(G12+G56)≥0.7  Equation (4); or

T3 and G34 may be controlled to satisfy the equation as follows:T3/G34≤3  Equation (5); or

G12, G34 and G56 may be controlled to satisfy the equation as follows:G34/(G12+G56)≥0.45  Equation (6); or

T3 and T6 may be controlled to satisfy the equation as follows:T6/T3≥0.6  Equation (7); or

T1 and T2 may be controlled to satisfy the equation as follows:T1/T2≤2.5  Equation (8); or

AAG and T2 may be controlled to satisfy the equation as follows:AAG/T2≤4  Equation (9); or

T2, G23 and G45 may be controlled to satisfy the equation as follows:T2/(G23+G45)≥0.8  Equation (10);or

T2 and G34 may be controlled to satisfy the equation as follows:T2/G34≥0.6  Equation (11);or

T4, G12 and G56 may be controlled to satisfy the equation as follows:T4/(G12+G56)≥1.5  Equation (12);or

AAG, G12 and G56 may be controlled to satisfy the equation as follows:AAG/(G12+G56)≥2  Equation (13);or

T4, G23 and G45 may be controlled to satisfy the equation as follows:T4/(G23+G45)≥1.9  Equation (14);or

T2 and T6 may be controlled to satisfy the equation as follows:T6/T2≤2.2  Equation(15); or

T2, G12, and G6 may be controlled to satisfy the equation as follows:T2/(G12+G56)≥0.9  Equation(16); or

T2 and T3 may be controlled to satisfy the equation as follow:T2/T3≥0.6  Equation(17); or

ALT and AAG may be controlled to satisfy the equation as follow:ALT/AAG≥3.5  Equation(18).

Aforesaid embodiments are not limiting and may be selectivelyincorporated in other embodiments described herein.

In some embodiments, additional features with respect to the convex orconcave surface structure may be incorporated for one specific lenselement or broadly for a plurality of lens elements to enhance thecontrol for system performance and/or resolution. It should be notedthat the features disclosed herein may be incorporated in exampleembodiments if no inconsistency occurs.

In some embodiments, a mobile device may comprise a housing and aphotography module positioned in the housing. The photography module maycomprise any of the aforesaid example embodiments of optical imaginglens, a lens barrel, a module housing unit and an image sensor. The lensbarrel may be suitable for positioning the optical imaging lens, themodule housing unit may be suitable for positioning the lens barrel, andthe image sensor may be positioned at the image side of the opticalimaging lens.

Through controlling the convex or concave shape of the surfaces, themobile device and the optical imaging lens thereof in exemplaryembodiments may achieve good optical characteristics and effectivelyshorten the length of the optical imaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of one single lens element according tothe present disclosure;

FIG. 2 is a schematic view of the relation between the surface shape andthe optical focus of the lens element;

FIG. 3 is a schematic view of a first example of the surface shape andthe efficient radius of the lens element;

FIG. 4 is a schematic view of a second example of the surface shape andthe efficient radius of the lens element;

FIG. 5 is a schematic view of a third example of the surface shape andthe efficient radius of the lens element;

FIG. 6 is a cross-sectional view of a first embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a first embodiment of the present disclosure;

FIG. 9 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 is a cross-sectional view of a second embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according the present disclosure;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosure;

FIG. 13 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 is a cross-sectional view of a third embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosure;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosure;

FIG. 17 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosure;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosure;

FIG. 21 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosure;

FIG. 25 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 27 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 28 is a table of optical data for each lens element of a sixthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 is a cross-sectional view of a seventh embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 31 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a seventh embodiment of the optical imaginglens according to the present disclosure;

FIG. 32 is a table of optical data for each lens element of the opticalimaging lens of a seventh embodiment of the present disclosure;

FIG. 33 is a table of aspherical data of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 34 is a cross-sectional view of a eighth embodiment of an opticalimaging lens having six lens elements according to the presentdisclosure;

FIG. 35 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a eighth embodiment of the optical imaginglens according the present disclosure;

FIG. 36 is a table of optical data for each lens element of the opticalimaging lens of a eighth embodiment of the present disclosure;

FIG. 37 is a table of aspherical data of a eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 38 is a table for the values of ALT/(G23+G45), T5/T2, T6/T3,T2/G34, AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3,T6/(G12+G56), T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45),T4/(G12+G56), T4/(G23+G45), and T6/T2 of all eight example embodiments;

FIG. 39 is a structure of an example embodiment of a mobile device;

FIG. 40 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

In the present specification, the description “a lens element havingpositive refracting power (or negative refractive power)” may indicatethat the paraxial refractive power of the lens element in Gaussianoptics is positive (or negative). The description “an object-side (orimage-side) surface of a lens element” may only include a specificregion of that surface of the lens element where imaging rays arecapable of passing through that region, namely the clear aperture of thesurface. The aforementioned imaging rays can be classified into twotypes, chief ray Lc and marginal ray Lm. Taking a lens element depictedin FIG. 1 as an example, the lens element may be rotationally symmetric,where the optical axis I may be the axis of symmetry. The region A ofthe lens element may be defined as “a part in a vicinity of the opticalaxis”, and the region C of the lens element may be defined as “a part ina vicinity of a periphery of the lens element.” Further, the lenselement may also have an extending part E extended radially andoutwardly from the region C, namely the part outside of the clearaperture of the lens element. The extending part E may usually be usedfor physically assembling the lens element into an optical imaging lenssystem. Under normal circumstances, the imaging rays would not passthrough the extending part E because those imaging rays may only passthrough the clear aperture. The structures and shapes of theaforementioned extending part E are only examples for technicalexplanation, the structures and shapes of lens elements should not belimited to these examples. Note that the extending parts of the lenselement surfaces depicted in the following embodiments are partiallyomitted.

The following criteria are provided for determining the shapes and theparts of lens element surfaces set forth in the present specification.These criteria mainly determine the boundaries of parts under variouscircumstances including the part in a vicinity of the optical axis, thepart in a vicinity of a periphery of a lens element surface, and othertypes of lens element surfaces such as those having multiple parts.

1. FIG. 1 is a radial cross-sectional view of a lens element. Beforedetermining boundaries of those aforesaid parts, two referential pointsshould be defined first, central point and transition point. The centralpoint of a surface of a lens element may be a point of intersection ofthat surface and the optical axis. The transition point may be a pointon a surface of a lens element, where the tangent line of that point isperpendicular to the optical axis. Additionally, if multiple transitionpoints appear on one single surface, then these transition points may besequentially named along the radial direction of the surface withnumbers starting from the first transition point. For instance, thefirst transition point (closest one to the optical axis), the secondtransition point, and the Nth transition point (farthest one to theoptical axis within the scope of the clear aperture of the surface). Thepart of a surface of the lens element between the central point and thefirst transition point may be defined as the part in a vicinity of theoptical axis. The part located radially outside of the Nth transitionpoint (but still within the scope of the clear aperture) may be definedas the part in a vicinity of a periphery of the lens element. In someembodiments, there may be other parts disposed or existing between thepart in a vicinity of the optical axis and the part in a vicinity of aperiphery of the lens element; the numbers of parts depend on thenumbers of the transition point(s). In addition, the radius of the clearaperture (or a so-called effective radius) of a surface may be definedas the radial distance from the optical axis I to a point ofintersection of the marginal ray Lm and the surface of the lens element.

2. Referring to FIG. 2, determining the shape of a part is convex orconcave may depend on whether a collimated ray passing through that partconverges or diverges. That is, while applying a collimated ray to apart to be determined in terms of shape, the collimated ray passingthrough that part may be bent and the ray itself or its extension linemay eventually meet the optical axis. The shape of that part can bedetermined by whether the ray or its extension line meets (intersects)the optical axis (focal point) at the object-side or image-side. Forinstance, if the ray itself intersects the optical axis at the imageside of the lens element after passing through a part, i.e. the focalpoint of this ray is at the image side (see point R in FIG. 2), the partmay be determined as having a convex shape. In contrast, if the raydiverges after passing through a part, the extension line of the ray mayintersect the optical axis at the object side of the lens element, i.e.the focal point of the ray may be at the object side (see point M inFIG. 2), that part may be determined as having a concave shape.Therefore, referring to FIG. 2, the part between the central point andthe first transition point may have a convex shape, the part locatedradially outside of the first transition point may have a concave shape,and the first transition point may be the point where the part having aconvex shape changes to the part having a concave shape, namely theborder of two adjacent parts. Alternatively, there may be another way totell whether a part in a vicinity of the optical axis has a convex orconcave shape by referring to the sign of an “R” value, which is the(paraxial) radius of curvature of a lens surface. The R value which iscommonly used in conventional optical design software such as Zemax andCodeV. The R value usually appears in the lens data sheet in thesoftware. For an object-side surface, positive R may mean that theobject-side surface is convex, and negative R may mean that theobject-side surface is concave. Conversely, for an image-side surface,positive R may mean that the image-side surface is concave, and negativeR may means that the image-side surface is convex. The result found byusing this method should be consistent as by using the other waymentioned above, which may determine surface shapes by referring towhether the focal point of a collimated ray is at the object side or theimage side.

3. For none transition point cases, the part in a vicinity of theoptical axis is defined as the part between 0˜50% of the effectiveradius (radius of the clear aperture) of the surface, whereas the partin a vicinity of a periphery of the lens element is defined as the partbetween 50˜100% of effective radius (radius of the clear aperture) ofthe surface.

Referring to the first example depicted in FIG. 3, only one transitionpoint, namely a first transition point, may appear within the clearaperture of the image-side surface of the lens element. Part I may be apart in a vicinity of the optical axis, and part II may be a part in avicinity of a periphery of the lens element. The part in a vicinity ofthe optical axis may be determined as having a concave surface due tothe R value at the image-side surface of the lens element is positive.The shape of the part in a vicinity of a periphery of the lens elementmay be different from that of the radially inner adjacent part, i.e. theshape of the part in a vicinity of a periphery of the lens element maybe different from the shape of the part in a vicinity of the opticalaxis; the part in a vicinity of a periphery of the lens element may havea convex shape.

Referring to the second example depicted in FIG. 4, a first transitionpoint and a second transition point may exist on the object-side surface(within the clear aperture) of a lens element. In which part I may bethe part in a vicinity of the optical axis, and part III may be the partin a vicinity of a periphery of the lens element. The part in a vicinityof the optical axis may have a convex shape because the R value at theobject-side surface of the lens element may be positive. The part in avicinity of a periphery of the lens element (part III) may have a convexshape. What is more, there may be another part having a concave shapeexisting or disposed between the first and second transition point (partII).

Referring to a third example depicted in FIG. 5, there may be notransition point on the object-side surface of the lens element. In thiscase, the part between 0˜50% of the effective radius (radius of theclear aperture) may be determined as the part in a vicinity of theoptical axis, and the part between 50˜100% of the effective radius maybe determined as the part in a vicinity of a periphery of the lenselement. The part in a vicinity of the optical axis of the object-sidesurface of the lens element may be determined as having a convex shapedue to its positive R value, and the part in a vicinity of a peripheryof the lens element may be determined as having a convex shape as well.

In the present disclosure, examples of an optical imaging lens which maybe a prime lens are provided. Example embodiments of an optical imaginglens may comprise an aperture stop, a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement and a sixth lens element, each of the lens elements may compriserefracting power, an object-side surface facing toward an object sideand an image-side surface facing toward an image side and a centralthickness defined along the optical axis. These lens elements may bearranged sequentially from the object side to the image side along anoptical axis, and example embodiments of the lens may comprise no otherlenses having refracting power beyond the six lens elements. The designof the detail characteristics of each lens element can provide theimproved imaging quality and short optical imaging lens.

The positive refracting power of the first lens element may provide thedesired positive refracting power for the optical imaging lens. Thenegative refracting power of the second lens element may amend theoptical aberration of the optical imaging lens. The aperture stop whichis in front of the object-side surface of the first lens element mayenhance the imaging quality and reduce the length of the optical imaginglens.

The object-side surface of the first lens element may comprise a convexportion in the vicinity of the optical axis and a convex portion in thevicinity of a periphery of the first lens element, and the convexportions of the first lens element can facilitate the collection oflight, the positive refracting powers of the fourth lens element and thefifth lens element may provide the desired positive refracting power ofthe optical imaging lens. The object-side surface of the second lenselement may comprise a concave portion in the vicinity of a periphery ofthe second lens element, the image-side surface of the third lenselement may comprise a convex portion in the vicinity of a periphery ofthe third lens element, the image-side surface of the fifth lens elementmay comprise a convex portion in the vicinity of a periphery of thefifth lens element, and the image-side surface of the sixth lens elementmay comprise a convex portion in the vicinity of a periphery of thesixth lens element. Because the shapes of first, second, third, fourth,fifth, and sixth lens elements are arranged, the imaging quality can beenhanced, the length and f-number of the optical imaging lens can bereduced, the view angle can be enlarged.

Moreover, the optical imaging lens may have desirable and/or optimizedoptical characteristics, the length can be reduced, the view angle canbe enlarged, and the f-number can be decreased via controlling someparameters described below. At the same time, the thickness of the airgap or lens element can be designed with suitable ratios to prevent thatthe thickness may be too long to be advantageous for smaller size andreduced production difficulty.

It may be desirable for ALT/(G23+G45) to satisfy the equation:ALT/(G23+G45)≥9.0. In some embodiments, a range of ALT/(G23+G45) may bebetween 9.0 and 25.0. It may be desirable for T5/T2 to satisfy theequation: T5/T2≤2.2. In some embodiments, a range of T5/T2 may bebetween 0.5 and 2.2. It may be desirable for T6/T3 to satisfy theequation: T6/T3≥0.6. In some embodiments, a range of T6/T3 may bebetween 0.6 and 2.0. It may be desirable for T2/G34 to satisfy theequation: T2/G34≥0.6. In some embodiments, T2/G34 may be between 0.6 and4.0. It may be desirable for AAG/(G12+G56) to satisfy the equation:AAG/(G12+G56)≥2.0. In some embodiments, the range of AAG/(G12+G56) maybe between 2.0 and 7.0. It may be desirable for T2/(G12+G56) to satisfythe equation: T2/(G12+G56)≥0.9. In some embodiments, the range ofT2/(G12+G56) may be between 0.9 and 3.0. It may be desirable for T2/T3to satisfy the equation: T2/T3≥0.6. In some embodiments, the perfectrange of T2/T3 may be between 0.6 and 1.5. It may be desirable forALT/AAG to satisfy the equation: ALT/AAG≥3.5. In some embodiments, therange of ALT/AAG may be between 3.5 and 6.0. It may be desirable forT1/T3 to satisfy the equation: T1/T3≥0.8. In some embodiments, theperfect range of T1/T3 may be between 0.8 and 2.0. It may be desirablefor T6/(G12+G56) to satisfy the equation: T6/(G12+G56)≥0.7. In someembodiments, the range of T6/(G12+G56) may be between 0.7 and 6.0. Itmay be desirable for T3/G34 to satisfy the equation: T3/G34≤3.0. In someembodiments, the range of T3/G34 may be between 0.5 and 3.0. It may bedesirable for G34/(G12+G56) to satisfy the equation: G34/(G12+G56)≥0.45.In some embodiments, the perfect range of G34/(G12+G56) may be between0.45 and 5.0. It may be desirable for T1/T2 to satisfy the equation:T1/T2≤2.5. In some embodiments, the perfect range of T1/T2 may bebetween 1.0 and 2.5. It may be desirable for AAG/T2 to satisfy theequation: AAG/T2≤4.0. In some embodiments AAG/T2 may be between 1.0 and4.0. It may be desirable for T2/(G23+G45) to satisfy the equation:T2/(G23+G45)≥0.8. In some embodiments, the range of T2/(G23+G45) may bebetween 0.8 and 3.0. It may be desirable for T4/(G12+G56) to satisfy theequation: T4/(G12+G56)≥1.5. In some embodiments, the range ofT4/(G12+G56) may be between 1.5 and 5.0. It may be desirable forT4/(G23+G45) to satisfy the equation: T4/(G23+G45)≥1.9. In someembodiments, the range of T4/(G23+G45) may be between 1.9 and 4.0. Itmay be desirable for T6/T2 to satisfy the equation: T6/T2≤2.2. In someembodiments, the range of T6/T2 may be between 0.6 and 2.2.

When implementing example embodiments, more details about the convex orconcave surface may be incorporated for one specific lens element orbroadly applied for a plurality of lens elements to enhance the controlfor system performance and/or resolution. It is noted that the detailslisted here could be incorporated in example embodiments if noinconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characteristics and a shortened length. Reference isnow made to FIGS. 6-9. FIG. 6 illustrates an example cross-sectionalview of an optical imaging lens 1 that may comprise six lens elements ofthe optical imaging lens according to a first example embodiment. FIG. 7shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens 1 according toan example embodiment. FIG. 8 illustrates an example table of opticaldata of each lens element of the optical imaging lens 1 according to anexample embodiment, in which f is used for representing EFL. FIG. 9depicts an example table of aspherical data of the optical imaging lens1 according to an example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in order from an object side A1 to an image side A2 alongan optical axis, an aperture stop 100, a first lens element 110, asecond lens element 120, a third lens element 130, a fourth lens element140, a fifth lens element 150 and a sixth lens element 160. A filteringunit 170 and an image plane 180 of an image sensor may be positioned atthe image side A2 of the optical lens 1. Each of the first, second,third, fourth, fifth, sixth lens elements 110, 120, 130, 140, 150, 160and the filtering unit 170 may comprise an object-side surface111/121/131/141/151/161/171 facing toward the object side A1 and animage-side surface 112/122/132/142/152/162/172 facing toward the imageside A2. The example embodiment of the filtering unit 170 illustratedmay be an IR cut filter (infrared cut filter) positioned between thesixth lens element 160 and an image plane 180. The filtering unit 170may selectively absorb light with specific wavelength from the lightpassing optical imaging lens 1. For example, IR light may be absorbed,and this may prohibit the IR light which is not seen by human eyes fromproducing an image on the image plane 180.

During the normal operation of the optical imaging lens 1, the distancebetween any two adjacent lens elements of the first, second, third,fourth, fifth and sixth lens elements 110, 120, 130, 140, 150, 160 maybe a unchanged value, i.e. the optical imaging lens 1 is a prime lens.

Exemplary embodiments of each lens element of the optical imaging lens 1which may be constructed by plastic material will now be described withreference to the drawings.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 may be a convex surfacecomprising a convex portion 1111 in a vicinity of the optical axis and aconvex portion 1112 in a vicinity of a periphery of the first lenselement 110. The image-side surface 112 may have a convex surfacecomprising a convex portion 1121 in a vicinity of the optical axis and aconvex portion 1122 in a vicinity of the periphery of the first lenselement 110. The object-side surface 111 and the image-side surface 112may be aspherical surfaces.

An example embodiment of the second lens element 120 may have negativerefracting power. The object-side surface 121 may comprise a concaveportion 1211 in a vicinity of the optical axis and a concave portion1212 in a vicinity of a periphery of the second lens element 120. Theimage-side surface 122 may comprise a concave portion 1221 in a vicinityof the optical axis and a convex portion 1222 in a vicinity of theperiphery of the second lens element 120.

An example embodiment of the third lens element 130 may have positiverefracting power. The object-side surface 131 may comprise a convexportion 1311 in a vicinity of the optical axis, a convex portion 1312 ina vicinity of a periphery of the third lens element 130, and a concaveportion 1313 between the convex portions 1311, 1312. The image-sidesurface 132 may be a convex surface comprising a convex portion 1321 ina vicinity of the optical axis and a convex portion 1322 in a vicinityof the periphery of the third lens element 130. The object-side surface131 and the image-side surface 132 may be aspherical surfaces.

An example embodiment of the fourth lens element 140 may have positiverefracting power. The object-side surface 141 may be a concave surfacecomprising a concave portion 1411 in a vicinity of the optical axis anda concave portion 1412 in a vicinity of a periphery of the fourth lenselement 140. The image-side surface 142 may comprise a convex portion1421 in a vicinity of the optical axis and a concave portion 1422 in avicinity of the periphery of the fourth lens element 140. Theobject-side surface 141 and the image-side surface 142 may be asphericalsurfaces.

An example embodiment of the fifth lens element 150 may have positiverefracting power. The object-side surface 151 may comprise a convexportion 1511 in a vicinity of the optical axis and a concave portion1512 in a vicinity of a periphery of the fifth lens element 150. Theimage-side surface 152 may be a convex surface comprising a convexportion 1521 in a vicinity of the optical axis and a convex portion 1522in a vicinity of the periphery of the fifth lens element 150. Theobject-side surface 151 and the image-side surface 152 may be asphericalsurfaces.

An example embodiment of the sixth lens element 160 may have negativerefracting power. The object-side surface 161 may be a concave surfacecomprising a concave portion 1611 in a vicinity of the optical axis anda concave portion 1612 in a vicinity of a periphery of the sixth lenselement 160. The image-side surface 162 may be a concave surfacecomprising a concave portion 1621 in a vicinity of the optical axis anda convex portion 1622 in a vicinity of the periphery of the sixth lenselement 160. The object-side surface 161 and the image-side surface 162may be aspherical surfaces.

In some embodiments, air gaps may exist between the lens elements 110,120, 130, 140, 150, 160, the filtering unit 170 and the image plane 180of the image sensor. For example, FIG. 1 illustrates the air gap d1 thatmay exist or be disposed between the first lens element 110 and thesecond lens element 120; the air gap d2 that may exist or be disposedbetween the second lens element 120 and the third lens element 130; theair gap d3 that may exist or be disposed between the third lens element130 and the fourth lens element 140; the air gap d4 that may exist or bedisposed between the fourth lens element 140 and the fifth lens element150; the air gap d5 that may exist or be disposed between the fifth lenselement 150 and the sixth lens element 160; the air gap d6 that mayexist or be disposed between the sixth lens element 160 and thefiltering unit 170; and the air gap d7 that may exist between thefiltering unit 170 and the image plane 180 of the image sensor. However,in some embodiments, any of the aforesaid air gaps may or may not exist.For example, the profiles of opposite surfaces of any two adjacent lenselements may correspond to each other, and in such situation, the airgap may not exist. The air gap d1 is denoted by G12, the air gap d2 isdenoted by G23, the air gap d3 is denoted by G34, the air gap d4 isdenoted by G45, the air gap d5 is denoted by G56 and the sum of d1, d2,d3, d4 and d5 is denoted by AAG.

FIG. 8 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 111 of the first lens element110 to the image plane 180 along the optical axis may be about 3.901 mm,the image height may be about 2.3 mm. The length of the optical imaginglens 1 may be shortened compared with conventional optical imaginglenses.

The aspherical surfaces may include the object-side surface 111 of thefirst lens element 110, the image-side surface 112 of the first lenselement 110, the object-side surface 121 and the image-side surface 122of the second lens element 120, the object-side surface 131 and theimage-side surface 132 of the third lens element 130, the object-sidesurface 141 and the image-side surface 142 of the fourth lens element140, the object-side surface 151 and the image-side surface 152 of thefifth lens element 150, the object-side surface 161 and the image-sidesurface 162 of the sixth lens element 160 are all defined by thefollowing aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}\;{a_{i} \times Y^{i}}}}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(i) represents an aspherical coefficient of i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7(a) shows the longitudinal spherical aberration, wherein thetransverse axis of FIG. 7(a) may define the focus, and the lengthwiseaxis of FIG. 7(a) may define the filed. From the vertical deviation ofeach curve shown in FIG. 7(a), the offset of the off-axis light relativeto the image point may be within about ±0.03 mm. Therefore, the firstembodiment may indeed improves the longitudinal spherical aberrationwith respect to different wavelengths. Furthermore, the curves ofdifferent wavelengths may be closed to each other, and this situationrepresents that off-axis light with respect to these wavelengths isfocused around an image point, and the aberration may be improved.

FIGS. 7(b) and 7(c) respectively show the astigmatism aberration in thesagittal direction and astigmatism aberration in the tangentialdirection, wherein the transverse axis of FIG. 7(b) may define thefocus, the lengthwise axis of FIG. 7(b) may define the image height, thetransverse axis of FIG. 7(c) may define the focus, and the lengthwiseaxis of FIG. 7(c) may define the image height. Referring to FIG. 7(b),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.08 mm.Referring to FIG. 7(c), the focus variation with respect to the threedifferent wavelengths (470 nm, 555 nm, 650 nm) in the whole field mayfall within about ±0.12 mm. Therefore, the optical imaging lens 1 mayeliminate aberration effectively. Additionally, the three curvespresenting different wavelengths may be closed to each other, and theseclosed curves may represent that the dispersion is improved. Pleaserefer to FIG. 7(d), the transverse axis of FIG. 7(d) may define thepercentage, and the lengthwise axis of FIG. 7(d) may define the imageheight, and the variation of the distortion aberration may be withinabout ±1.2%.

The variation of the distortion aberration of the present embodiment mayconform to the demand of imaging quality. Additionally, the opticalimaging lens of this embodiment compares with the current opticalimaging lens, the total length of the optical imaging lens may beshortened to about 3.9 mm, the optical imaging lens 1 of the presentembodiment can eliminate aberration effectively and provide betterimaging quality. The optical imaging lens 1 of the example embodimentmay indeed achieve great optical performance and the length of theoptical imaging lens 1 may effectively be shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having six lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 231 for labeling theobject-side surface of the third lens element 230, reference number 232for labeling the image-side surface of the third lens element 230, etc.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 200, a first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240, a fifth lens element 250 and a sixth lens element 260.

The differences between the second embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the aspherical data, the back focal length, and the configuration of theconcave/convex shape of the object-side surfaces 221, 231 and theimage-side surface 232, but the configuration of the positive/negativerefracting power of the first, second, third, fourth, fifth lenselements, and sixth lens element 210, 220, 230, 240, 250, 260 andconfiguration of the concave/convex shape of the object-side surfaces211, 241, 251, 261 facing to the object side A1 and the image-sidesurfaces 212, 222, 242, 252, 262 facing to the image side A2 are similarto those in the first embodiment. Here, for clearly showing the drawingsof the present embodiment, only the surface shapes which are differentfrom that in the first embodiment are labeled. Specifically, theobject-side surface 221 of the second lens element 220 may comprise aconcave portion 2211 in a vicinity of the optical axis, a concaveportion 2212 in the vicinity of a periphery of the second lens element220, and a convex portion 2213 between the two concave portions 2211,2212; the object-side surface 231 of the third lens element 230 maycomprise a convex portion 2311 in the vicinity of the optical axis and aconcave portion 2312 in the vicinity of a periphery of the third lenselement 230; the image-side surface 232 of the third lens element 230may comprise a concave portion 2321 in the vicinity of the optical axisand a convex portion 2322 in the vicinity of a periphery of the thirdlens element 230; and the object-side surface 251 of the fifth lenselement 250 may comprise a concave portion 2511 in the vicinity of theoptical axis and a concave portion 2512 in the vicinity of a peripheryof the fifth lens element 250.

Please refer to FIG. 12 for the optical characteristics of each lenselements in the optical imaging lens 2 the present embodiment, andplease refer to FIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3,T2/G34, AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3,T6/(G12+G56), T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45),T4/(G12+G56), T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 211 of the first lens element210 to the image plane 280 along the optical axis is 3.904 mm, imageheight may be about 2.3 mm, and the length of the length of the opticalimaging lens 2 may be shortened compared with conventional opticalimaging lenses.

FIG. 11(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 11(a), the offset of theoff-axis light relative to the image point may be within about ±0.06 mm.Furthermore, the three curves having different wavelengths may be closedto each other, and this situation may represent that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration may be improved.

FIGS. 11(b) and 11(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection, Referring to FIG. 11(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within about ±0.2 mm. Referring to FIG. 11(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about +0.16 mm.Additionally, the three curves presenting different wavelengths may beclosed to each other, and these closed curves may represent that thedispersion is improved. Please refer to FIG. 11(d), the variation of thedistortion aberration of the optical imaging lens 2 may be within about±2%.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having six lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 16 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 17 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 331 for labeling the object-sidesurface of the third lens element 330, reference number 332 for labelingthe image-side surface of the third lens element 330, etc.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 300, a first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340, a fifth lens element 350 and a sixth lens element 360.

The differences between the third embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the aspherical data, the back focal length, and the configuration of theconcave/convex shape of the object-side surface 331 and the image-sidesurface 352, but the configuration of the positive/negative refractingpower of the first, second, third, fourth, fifth and sixth lens element310, 320, 330, 340, 350, 360 and configuration of the concave/convexshape of the object-side surfaces 311, 321, 341, 351, 361 facing to theobject side A1 and the image-side surfaces 312, 322, 332, 342, 362facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 331of the third lens element 330 may comprise a convex portion 3311 in avicinity of the optical axis and a concave portion 3312 in the vicinityof a periphery of the third lens element 330; and the image-side surface352 of the fifth lens element 350 may comprise a concave portion 3521 inthe vicinity of the optical axis and a convex portion 3522 in thevicinity of a periphery of the fifth lens element 350.

FIG. 16 depicts the optical characteristics of each lens elements in theoptical imaging lens 3 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 311 of the first lens element310 to the image plane 380 along the optical axis may be about 3.888 mm,the image height may be about 2.3 mm and the length of the opticalimaging lens 3 may be shortened compared with conventional opticalimaging lenses.

FIG. 15(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 15(a), the offset of theoff-axis light relative to the image point may be within about ±0.03 mm.Furthermore, the three curves having different wavelengths may be closedto each other, and this situation may represent that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration may be improved.

FIGS. 15(b) and 15(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 15(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within about ±0.12 mm. Referring to FIG. 15(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about ±0.12 mm.Additionally, the three curves presenting different wavelengths may beclosed to each other, and these closed curves represents that thedispersion may be improved. Please refer to FIG. 15(d), the variation ofthe distortion aberration of the optical imaging lens 3 may be withinabout ±1.2%.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having six lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 20 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 431 for labeling the object-side surface ofthe third lens element 430, reference number 432 for labeling theimage-side surface of the third lens element 430, etc.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 400, a first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 44, a fifth lens element 450 and a sixth lens element 460.

The differences between the fourth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, theaspherical data, back focal length, and the configuration of theconcave/convex shape of the object-side surface 431 and the image-sidesurface 432, but the configuration of the positive/negative refractingpower of the first, second, third, fourth fifth and sixth lens elements410, 420, 430, 440, 450, 460 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 411, 421, 441,451, 461 facing to the object side A1 and the image-side surfaces 412,422, 442, 452, 462 facing to the image side A2, are similar to those inthe first embodiment. Here, for clearly showing the drawings of thepresent embodiment, only the surface shapes which are different fromthat in the first embodiment are labeled. Specifically, the object-sidesurface 431 of the third lens element 430 may comprise a convex portion4311 in the vicinity of the optical axis and a concave portion 4312 inthe vicinity of a periphery of the third lens element 430; and theimage-side surface 432 of the third lens element 430 may comprise aconcave portion 4321 in the vicinity of the optical axis and a convexportion 4322 in the vicinity of a periphery of the third lens element430.

FIG. 20 depicts the optical characteristics of each lens elements in theoptical imaging lens 4 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 411 of the first lens element410 to the image plane 480 along the optical axis is 3.891 mm, imageheight is 2.3 mm, and the length of the optical imaging lens 4 isshortened compared with conventional optical imaging lenses.

FIG. 19(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 19(a), the offset of theoff-axis light relative to the image point is within ±0.02 mm.Furthermore, the three curves having different wavelengths are closed toeach other, and this situation represents that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration can be improved.

FIGS. 19(b) and 19(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 19(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield falls within ±0.12 mm. Referring to FIG. 19(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field falls within ±0.12 mm. Additionally, thethree curves presenting different wavelengths are closed to each other,and these closed curves represents that the dispersion is improved.Please refer to FIG. 19(d), the variation of the distortion aberrationof the optical imaging lens 4 is within +1.2%.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having six lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 531 for labeling the object-side surface ofthe third lens element 530, reference number 532 for labeling theimage-side surface of the third lens element 530, etc.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 500, a first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540, a fifth lens element 550 and a sixth lens element 560.

The differences between the fifth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the aspherical data, and back focal length, and configuration of theconcave/convex shape of the object-side surface 531 and the image-sidesurface 532. But the configuration of the positive/negative refractingpower of the first, second, third, fourth, fifth and sixth lens elements510, 520, 530, 540, 550, 560 and configuration of the concave/convexshape of the object-side surfaces 511, 521, 541, 551, 561 facing to theobject side A1 and the image-side surfaces 512, 522, 532, 542, 562facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 531of the third lens element 530 may comprise a convex portion 5311 in thevicinity of the optical axis and a concave portion 5312 in the vicinityof a periphery of the third lens element 530; and the image-side surface552 of the fifth lens element 550 may comprise a convex portion 5521 inthe vicinity of the optical axis, a convex portion 5522 in the vicinityof a periphery of the fifth lens element 550, and a concave portion 5523between the two convex portions 5521, 5522.

FIG. 24 depicts the optical characteristics of each lens elements in theoptical imaging lens 5 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 511 of the first lens element510 to the image plane 580 along the optical axis may be about 3.891 mm,the image height may be about 2.3 mm, and the length of the opticalimaging lens 5 may be shortened compared with conventional opticalimaging lenses and even with the optical imaging lens 5 of the firstembodiment. Thus, the optical imaging lens 5 may be capable of providingexcellent imaging quality for smaller sized mobile devices.

FIG. 23(a) shows the longitudinal spherical aberration of the firstembodiment. From the vertical deviation of each curve shown in FIG.23(a), the offset of the off-axis light relative to the image point maybe within about ±0.02 mm. Furthermore, the three curves having differentwavelengths may be closed to each other, and this situation mayrepresent that off-axis light with respect to these wavelengths may befocused around an image point, and the aberration may be improved.

FIGS. 23(b) and 23(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 23(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within about ±0.16 mm. Referring to FIG. 23(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about ±0.2 mm.Additionally, the three curves presenting different wavelengths areclosed to each other, and these closed curves represents that thedispersion is improved. Please refer to FIG. 23(d), the variation of thedistortion aberration of the optical imaging lens 5 may be within about±1.2%.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having six lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 27 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 28 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 631 for labeling the object-side surface ofthe third lens element 630, reference number 632 for labeling theimage-side surface of the third lens element 630, etc.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 600, a first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640, a fifth lens element 650 and a sixth lens element 660.

The differences between the sixth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the aspherical data, back focal length, and the configuration of theconcave/convex shape of the object-side surface 631 and the image-sidesurface 632, but the configuration of the positive/negative refractingpower of the first, second, third, fourth, fifth and sixth lens elements610, 620, 630, 640, 650, 660 and configuration of the concave/convexshape of the object-side surfaces 611, 621, 641, 651, 661 facing to theobject side A1 and the image-side surfaces 612, 622, 642, 652, 662facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 631of the third lens element 630 may comprise a convex portion 6311 in thevicinity of the optical axis and a concave portion 6312 in the vicinityof a periphery of the third lens element 630, and the image-side surface632 of the third lens element 630 may comprise a concave portion 6321 inthe vicinity of the optical axis and a convex portion 6322 in thevicinity of a periphery of the third lens element 630.

FIG. 28 depicts the optical characteristics of each lens elements in theoptical imaging lens 6 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 611 of the first lens element610 to the image plane 680 along the optical axis is about 3.891 mm, theimage height is about 3.0 mm, and the length of the optical imaging lens6 is shortened compared with conventional optical imaging lenses. Thus,the optical imaging lens 6 may capable of providing excellent imagingquality for smaller sized mobile devices.

FIG. 27(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 27(a), the offset of theoff-axis light relative to the image point may be within about ±0.01 mm.Furthermore, the three curves having different wavelengths may be closedto each other, and this situation may represent that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration may be improved.

FIGS. 27(b) and 27(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 27(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may falls within about ±0.08 mm. Referring to FIG. 23(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm, 650 nm) in the whole field may fall within about +0.12 mm.Additionally, the three curves presenting different wavelengths areclosed to each other, and these closed curves represents that thedispersion is improved. Please refer to FIG. 27(d), the variation of thedistortion aberration of the optical imaging lens 6 is within ±0.8%.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having six lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 31 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 7, forexample, reference number 731 for labeling the object-side surface ofthe third lens element 730, reference number 732 for labeling theimage-side surface of the third lens element 730, etc.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 700, a first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740, a fifth lens element 750 and a sixth lens element 760.

The differences between the seventh embodiment and the first embodimentmay include the radius of curvature, thickness of each lens element, theaspherical data, back focal length, and the configuration of theconcave/convex shape of the image-side surface 732, but theconfiguration of the positive/negative refracting power of the first,second, third, fourth, fifth and sixth lens elements 710, 720, 730, 740,750, 760 and configuration of the concave/convex shape of theobject-side surfaces 711, 721, 731, 741, 751, 761 facing to the objectside A1 and the image-side surfaces 712, 722, 742, 752, 762 facing tothe image side A2, are similar to those in the first embodiment. Here,for clearly showing the drawings of the present embodiment, only thesurface shapes which are different from that in the first embodiment arelabeled. Specifically, the image-side surface 732 of the third lenselement 730 may comprise a concave portion 7321 in the vicinity of theoptical axis and a convex portion 7322 in the vicinity of a periphery ofthe third lens element 730.

FIG. 32 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 711 of the first lens element710 to the image plane 780 along the optical axis may be about 3.801 mm,the image height may be about 2.3 mm, and the length of the opticalimaging lens 7 may be shortened compared with conventional opticalimaging lenses.

FIG. 31(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 31(a), the offset of theoff-axis light relative to the image point may be within about ±0.01 mm.Furthermore, the three curves having different wavelengths may be closedto each other, and this situation may represent that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration may be improved.

FIGS. 31(b) and 31(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 31(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within about ±0.12 mm. Referring to FIG. 31(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about +0.12 mm.Additionally, the three curves presenting different wavelengths may beclosed to each other, and these closed curves may represent that thedispersion is improved. Please refer to FIG. 31(d), the variation of thedistortion aberration of the optical imaging lens 7 may be within ±0.8%.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having six lenselements of the optical imaging lens according to an eighth exampleembodiment. FIG. 35 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 36 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 37 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 8, forexample, reference number 831 for labeling the object-side surface ofthe third lens element 830, reference number 832 for labeling theimage-side surface of the third lens element 830, etc.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 800, a first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840, a fifth lens element 850 and a sixth lens element 860.

The differences between the eighth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the aspherical data, back focal length, and the configuration of theconcave/convex shape of the object-side surfaces 821, 831 and image-sidesurface 852, but the configuration of the positive/negative refractingpower of the first, second, third, fourth, fifth and sixth lens elements810, 820, 830, 840, 850, 860 and configuration of the concave/convexshape of the object-side surfaces 811, 841, 851, 861 facing to theobject side A1 and the image-side surfaces 812, 822, 832, 842, 862facing to the image side A2, are similar to those in the firstembodiment. Here, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment are labeled. Specifically, the object-side surface 821of the second lens element 820 may comprise a convex portion 8211 in avicinity of the optical axis and a concave portion 8212 in a vicinity ofa periphery of the second lens element 820; the object-side surface 831of the third lens element 830 may comprise a convex portion 8311 in avicinity of the optical axis and a concave portion 8312 in a vicinity ofa periphery of the third lens element 830; and the image-side surface852 of the fifth lens element 850 may comprise a concave portion 8521 inthe vicinity of the optical axis and a convex portion 8522 in a vicinityof a periphery of the fifth lens element 850.

FIG. 36 depicts the optical characteristics of each lens elements in theoptical imaging lens 8 of the present embodiment, and please refer toFIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3, T2/G34,AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3, T6/(G12+G56),T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45), T4/(G12+G56),T4/(G23+G45), and T6/T2 of the present embodiment.

The distance from the object-side surface 811 of the first lens element810 to the image plane 880 along the optical axis may be about 3.911 mm,the image height may be about 2.3 mm, and the length of the opticalimaging lens 8 may be shortened compared with conventional opticalimaging lenses. Thus, the optical imaging lens 8 may be capable toprovide excellent imaging quality for smaller sized mobile devices.

FIG. 35(a) shows the longitudinal spherical aberration. From thevertical deviation of each curve shown in FIG. 35(a), the offset of theoff-axis light relative to the image point may be within about ±0.02 mm.Furthermore, the three curves having different wavelengths are closed toeach other, and this situation represents that off-axis light withrespect to these wavelengths is focused around an image point, and theaberration can be improved.

FIGS. 35(b) and 35(c) respectively show the astigmatism aberration inthe sagittal direction and astigmatism aberration in the tangentialdirection. Referring to FIG. 35(b), the focus variation with respect tothe three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within about ±0.08 mm. Referring to FIG. 35(c), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about ±0.04 mm.Additionally, the three curves presenting different wavelengths areclosed to each other, and these closed curves represents that thedispersion is improved. Please refer to FIG. 35(d), the variation of thedistortion aberration of the optical imaging lens 8 may be within about±0.8%.

Please refer to FIG. 38 for the values of ALT/(G23+G45), T5/T2, T6/T3,T2/G34, AAG/(G12+G56), T2/(G12+G56), T2/T3, ALT/AAG, T1/T3,T6/(G12+G56), T3/G34, G34/(G12+G56), T1/T2, AAG/T2, T2/(G23+G45),T4/(G12+G56), T4/(G23+G45), and T6/T2 of all eight embodiments, and itis clear that the optical imaging lens of the present invention satisfythe Equations (1)˜(18).

Reference is now made to FIG. 39, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 may comprise ahousing 21 and a photography module 22 positioned in the housing 21.Examples of the mobile device 20 may be, but are not limited to, amobile phone, a camera, a tablet computer, a personal digital assistant(PDA), etc.

As shown in FIG. 39, the photography module 22 has an optical imaginglens with fixed focal length, wherein the photography module 22 maycomprise the aforesaid optical imaging lens with six lens elements. Forexample, photography module 22 may comprise the optical imaging lens 1of the first embodiment, a lens barrel 23 for positioning the opticalimaging lens 1, a module housing unit 24 for positioning the lens barrel23, a substrate 182 for positioning the module housing unit 24, and animage sensor 181 which is positioned at an image side of the opticalimaging lens 1. The image plane 180 may be formed on the image sensor181.

In some other example embodiments, the structure of the filtering unit170 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 181 used in the present embodiment may bedirectly attached to a substrate 182 in the form of a chip on board(COB) package, and such package may be different from traditional chipscale packages (CSP) since COB package does not require a cover glassbefore the image sensor 181 in the optical imaging lens 1. Aforesaidexemplary embodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The six lens elements 110, 120, 130, 140, 150, 160 may be positioned inthe lens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 may comprise a lens backseat 2401 forpositioning the lens barrel 23 and an image sensor base 2406 positionedbetween the lens backseat 2401 and the image sensor 181. The lens barrel23 and the lens backseat 2401 may be positioned along a same axis I-I′,and the lens backseat 2401 is positioned at the inside of the lensbarrel 23. The image sensor base 2406 may be close to the lens backseat2401 here. The image sensor base 2406 could be optionally omitted insome other embodiments of the present invention.

Because the length of the optical imaging lens 1 may be merely about4.132 mm, the size of the mobile device 20 may be quite small.Therefore, the embodiments described herein meet the market demand forsmaller sized product designs.

Reference is now made to FIG. 40, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprising a first seatunit 2402, a second seat unit 2403, a coil 2404 and a magnetic unit2405. The first seat unit 2402 may be close to the outside of the lensbarrel 23, and positioned along an axis I-I′, and the second seat unit2403 is around the outside of the first seat unit 2402 and positionedalong with the axis I-I′. The coil 2404 may be positioned between theoutside of the first seat unit 2402 and the inside of the second seatunit 2403. The magnetic unit 2405 may be positioned between the outsideof the coil 2404 and the inside of the second seat unit 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein maybe driven by the first seat unit 2402 for moving along the axis I-I′.The rest structure of the mobile device 20′ may be similar to the mobiledevice 20.

Similarly, because the length of the optical imaging lens 1 may be about3.901 mm, is shortened, the mobile device 20′ may be designed with asmaller size and meanwhile good optical performance is still provided.Therefore, the present embodiment may meet the demands of small sizedproduct design and the request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling the detail structure of the lens elements and an inequality,the length of the optical imaging lens is effectively shortened andmeanwhile good optical characteristics are still provided.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequentially from anobject side to an image side along an optical axis, comprising first,second, third, fourth, fifth and sixth lens elements, each of saidfirst, second, third, fourth, fifth and sixth lens elements havingrefracting power, an object-side surface facing toward the object side,an image-side surface facing toward the image side, and a centralthickness defined along the optical axis, wherein: said first lenselement has positive refracting power, said object-side surface of saidfirst lens element comprises a convex portion in a vicinity of theoptical axis and a convex portion in a vicinity of a periphery of thefirst lens element; said second lens element has negative refractingpower, said object-side surface of said second lens element comprises aconcave portion in a vicinity of a periphery of the second lens elementand a concave portion in a vicinity of the optical axis; said image-sidesurface of said third lens element comprises a convex portion in avicinity of a periphery of the third lens element; said fourth lenselement has positive refracting power; said fifth lens element haspositive refracting power, said image-side surface of said fifth lenselement comprises a convex portion in a vicinity of a periphery of thefifth lens element; said image-side surface of said sixth lens elementcomprises a convex portion in a vicinity of a periphery of the sixthlens element; the optical imaging lens comprises no other lenses havingrefracting power beyond the six lens element, a sum of a centralthicknesses of all six lens elements along the optical axis isrepresented by ALT, an air gap between the second lens element and thethird lens element along the optical axis is represented by G23, an airgap between the fourth lens element and the fifth lens element along theoptical axis is represented by G45, ALT, G23 and G45 satisfy theequation: ALT/(G23+G45)≥9.0; and a central thickness of the sixth lenselement is represented by T6, an air gap between the first lens elementand the second lens element along the optical axis is represented byG12, an air gap between the fifth lens element and the sixth lenselement along the optical axis is represented by G56, T6, G12 and G56satisfy the equation: T6/(G12+G56)≥0.7.
 2. The optical imaging lensaccording to claim 1, wherein a central thickness of the second lenselement is represented by T2, a central thickness of the fifth lenselement is represented by T5, T2 and T5 satisfy the equation: T5/T2≤2.2.3. The optical imaging lens according to claim 2, wherein a centralthickness of the first lens element is represented by T1, a centralthickness of the third lens element is represented by T3, T1 and T3satisfy the equation: T1/T3≥0.8.
 4. The optical imaging lens accordingto claim 2, wherein a central thickness of the third lens element isrepresented by T3, an air gap between the third lens element and thefourth lens element along the optical axis is represented by G34, T3 andG34 satisfy the equation: T3/G34≤3.
 5. The optical imaging lensaccording to claim 2, wherein an air gap between the third lens elementand the fourth lens element along the optical axis is represented byG34, G12, G34 and G56 satisfy the equation: G34/(G12+G56)≥0.45.
 6. Theoptical imaging lens according to claim 1, wherein a central thicknessof the third lens element is represented by T3, T3 and T6 satisfy theequation: T6/T3≥0.6.
 7. The optical imaging lens according to claim 6,wherein a central thickness of the first lens element is represented byT1, a central thickness of the second lens element is represented by T2,T1 and T2 satisfy the equation: T1/T2≤2.5.
 8. The optical imaging lensaccording to claim 6, wherein a sum of all five air gaps from the firstlens element to the sixth lens element along the optical axis isrepresented by AAG, a central thickness of the second lens element isrepresented by T2, AAG and T2 satisfy the equation: AAG/T2≤4.
 9. Theoptical imaging lens according to claim 6, wherein a central thicknessof the second lens element is represented by T2, an air gap between thesecond lens element and the third lens element along the optical axis isrepresented by G23, T2, G23 and G45 satisfy the equation:T2/(G23+G45)≥0.8.
 10. The optical imaging lens according to claim 1,wherein a central thickness of the second lens element is represented byT2, an air gap between the third lens element and the fourth lenselement along the optical axis is represented by G34, T2 and G34 satisfythe equation: T2/G34≥0.6.
 11. The optical imaging lens according toclaim 10, wherein a central thickness of the fourth lens element isrepresented by T4, T4, G12 and G56 satisfy the equation:T4/(G12+G56)≥1.5.
 12. The optical imaging lens according to claim 1,wherein a sum of all five air gaps from the first lens element to thesixth lens element along the optical axis is represented by AAG, AAG,G12 and G56 satisfy the equation: AAG/(G12+G56)≥2.
 13. The opticalimaging lens according to claim 12, wherein a central thickness of thefourth lens element is represented by T4, an air gap between the secondlens element and the third lens element along the optical axis isrepresented by G23, an air gap between the fourth lens element and thefifth lens element along the optical axis is represented by G45, T4, G23and G45 satisfy the equation: T4/(G23+G45)≥1.9.
 14. The optical imaginglens according to claim 12, wherein a central thickness of the secondlens element is represented by T2, T2 and T6 satisfy the equation:T6/T2≤2.2.
 15. The optical imaging lens according to claim 1, wherein acentral thickness of the second lens element is represented by T2, anair gap between the second lens element and the third lens element alongthe optical axis is represented by G23, T2, G23 and G56 satisfy theequation: T2/(G23+G56)≥0.9.
 16. The optical imaging lens according toclaim 1, wherein a central thickness of the second lens element isrepresented by T2, a central thickness of the third lens element isrepresented by T3, T2 and T3 satisfy the equation: T2/T3≥0.6.
 17. Theoptical imaging lens according to claim 1, wherein a sum of a centralthicknesses of all six lens elements along the optical axis isrepresented by ALT, a sum of all five air gaps from the first lenselement to the sixth lens element along the optical axis is representedby AAG, ALT and AAG satisfy the equation: ALT/AAG≥3.5.
 18. A mobiledevice, comprising: a housing; and a photography module positioned inthe housing and comprising: an optical imaging lens, sequentially froman object side to an image side along an optical axis, comprising first,second, third, fourth, fifth and sixth lens elements, each of saidfirst, second, third, fourth, fifth and sixth lens elements havingrefracting power, an object-side surface facing toward the object side,an image-side surface facing toward the image side, and a centralthickness defined along the optical axis, wherein: said first lenselement has positive refracting power, said object-side surface of saidfirst lens element comprises a convex portion in a vicinity of theoptical axis and a convex portion in a vicinity of a periphery of thefirst lens element; said second lens element has negative refractingpower, said object-side surface of said second lens element comprises aconcave portion in a vicinity of a periphery of the second lens elementand a concave portion in a vicinity of the optical axis; said image-sidesurface of said third lens element comprises a convex portion in avicinity of a periphery of the third lens element; said fourth lenselement has positive refracting power; said fifth lens element haspositive refracting power, said image-side surface of said fifth lenselement comprises a convex portion in a vicinity of a periphery of thefifth lens element; said image-side surface of said sixth lens elementcomprises a convex portion in a vicinity of a periphery of the sixthlens element; the optical imaging lens comprises no other lenses havingrefracting power beyond the six lens element, a sum of a centralthicknesses of all six lens elements along the optical axis isrepresented by ALT, an air gap between the second lens element and thethird lens element along the optical axis is represented by G23, an airgap between the fourth lens element and the fifth lens element along theoptical axis is represented by G45, ALT, G23 and G45 satisfy theequation: ALT/(G23+G45)≥9.0, and a central thickness of the sixth lenselement is represented by T6, an air gap between the first lens elementand the second lens element along the optical axis is represented byG12, an air gap between the fifth lens element and the sixth lenselement along the optical axis is represented by G56, T6, G12 and G56satisfy the equation: T6/(G12+G56)≥0.7; a lens barrel for positioningthe optical imaging lens; a module housing unit for positioning the lensbarrel; and an image sensor positioned at the image side of the opticalimaging lens.